window.onload = function() {
	var oBtn = document.getElementsByTagName('button')[0];

	oBtn.onclick = function() {
		var xhr = new XMLHttpRequest();
		xhr.open('get', '1.md', true);
		xhr.send();

		xhr.onreadystatechange = function() {
			if(xhr.readyState == 4) {
				alert(xhr.responseText);
			}
		};
	};
};


